tests: Drop some unused qemunbdkit data files

The test still passes after deleting them, which seems to
indicate that they're unnecessary.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

tests/qemunbdkitdata/disk-network-source-curl.args.disk2.pipe.782

@@ -1 +0,0 @@
-cookie1=cookievalue1; cookie2=cookievalue2; cookie3=cookievalue3

tests/qemunbdkitdata/disk-network-ssh.args.disk1

@@ -1,8 +0,0 @@
-nbdkit \
---unix /tmp/statedir-1/nbdkit-test-disk-1.socket \
---foreground ssh \
-host=example.org \
-port=2222 \
-path=test2.img \
-user=testuser \
-password=-777

tests/qemunbdkitdata/disk-network-ssh.args.disk1.pipe.778

@@ -1 +0,0 @@
-iscsi-mycluster_myname-secret

tests/qemunbdkitdata/disk-network-ssh.args.disk2

@@ -1,9 +0,0 @@
-nbdkit \
---unix /tmp/statedir-2/nbdkit-test-disk-2.socket \
---foreground ssh \
-host=example.org \
-port=2222 \
-path=test2.img \
-identity=/path/to/id_rsa \
-user=myuser \
-known-hosts=/path/to/ssh_known_hosts